Intelligent construction waste classification device

Abstract

The application relates to the technical field of construction waste classification, and particularly relates to a construction waste intelligent classification device, which comprises a separation box, a deflection mechanism, a lifting mechanism, a driving mechanism, a grabbing mechanism and an electric sliding rail, one end of the separation box is fixedly connected with a feeding hopper, a stacking cavity is arranged in the separation box, a supporting plate is arranged at the bottom end of the stacking cavity, the number of the lifting mechanisms is two, and the two lifting mechanisms are arranged on the two sides of the separation box. In the application, the driving mechanism drives the lifting rod to be inserted into the garbage in the stacking cavity downwards, then the deflection mechanism drives the transmission roller to rotate, the one end of the lifting rod is lifted upwards, the flexible garbage in the garbage is picked out through the lifting rod, the flexible garbage in the garbage stack is picked up to the surface of the garbage stack through the continuous insertion and lifting of the lifting rod, the flexible garbage on the lifting rod is grabbed through the downward movement of the grabbing mechanism, and the flexible garbage in the garbage stack is separated.

Description

Technical Field

[0001] This invention relates to the field of construction waste sorting technology, specifically to an intelligent construction waste sorting device. Background Technology

[0002] Construction waste recycling technology is widely used in recycled aggregates, recycled concrete and mortar, and construction waste in road engineering. The recycling process primarily involves crushing or breaking down bricks and stones from solid waste for reuse. However, solid waste also contains metal parts, flexible fabrics, and wood, among other things. Before recycling, construction waste needs to be sorted. Flexible fabrics tend to entangle other objects, so they are usually sorted first. Currently, sorting flexible fabrics is done manually, which is labor-intensive. Summary of the Invention

[0003] The purpose of this invention is to provide an intelligent sorting device for construction waste to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A smart construction waste sorting device, including A separation box is fixedly connected to a feed hopper at one end. The separation box has a material stacking cavity inside, and a support plate is provided at the bottom of the material stacking cavity. There are two lifting mechanisms, which are located on both sides of the separation box. Each lifting mechanism includes a drive roller, which is rotatably connected to the separation box. Multiple lifting rods are equidistantly slidably inserted into the outer wall of the drive roller. There are two drive mechanisms, each corresponding to one of the two lifting mechanisms. The drive mechanism is used to drive the lifting rod to slide on the transmission roller. A deflection mechanism is fixed at the other end of the separation box. The deflection mechanism is connected to one end of the two drive rollers and is used to drive the drive rollers to rotate. A gripping mechanism is installed above the separation box, and the gripping mechanism is used to grip the waste; An electric slide rail is fixedly installed above the separation box, and a winch is fixedly installed on the moving end of the electric slide rail. The winch is used to lift and lower the gripping mechanism.

[0005] Furthermore, one end of the pallet is rotatably connected to one end of the separation box, a hydraulic rod is provided below the pallet, one end of the hydraulic rod is rotatably connected to the pallet, and the other end of the hydraulic rod is rotatably mounted on the ground.

[0006] Furthermore, the inner wall of the separation box is provided with inclined surfaces on both sides of the stacking cavity, and arc-shaped clearance grooves are provided on both sides of the inner wall of the separation box corresponding to the positions of multiple lifting rods. One end of the lifting rod passes through the arc-shaped clearance groove at the corresponding position and extends into the stacking cavity.

[0007] Furthermore, the deflection mechanism includes a second hydraulic rod, the bottom end of which is fixedly connected to the other end of the separation box. One end of the transmission roller is fixedly sleeved with a second connecting rod, and one end of the second connecting rod is rotatably connected to a first connecting rod. One end of each of the first connecting rods is rotatably connected to the movable end of the second hydraulic rod.

[0008] Furthermore, the driving mechanism includes a second crossbeam, with a first crossbeam fixedly connected to the other ends of the plurality of lifting rods. Sliding rods are fixedly connected to both ends of one side wall of the second crossbeam, and the sliding rods are slidably inserted into the first crossbeam. A drive shaft is rotatably connected between the two ends of the second crossbeam. A drive motor is fixedly installed at one end of the second crossbeam, and the output end of the drive motor is connected to one end of the drive shaft. Rotatable guide wheels are fixedly installed at both ends of the outer side wall of the transmission roller. A take-up wheel is fixedly sleeved on the outer side wall of one end of the transmission shaft. Rotatable guide wheels are installed at both ends of the other side wall of the second crossbeam. A pull rope is fixedly connected to one end of the first crossbeam. One end of the pull rope passes sequentially around one guide wheel, two guide wheels, and another guide wheel located at one end of the transmission roller. One end of the pull rope is wound around the take-up wheel. A return spring is movably sleeved on the other end of the lifting rod, and the return spring is located between the first crossbeam and the transmission roller. Circular holes are provided on both the first and second crossbeams corresponding to the positions through which the pull rope passes.

[0009] Furthermore, each end of one side wall of the cross frame is rotatably connected to a contact wheel, and the outer side wall of the transmission shaft is fixedly fitted with a wave wheel corresponding to the two contact wheel positions, the outer contour of the wave wheel's cross section being wave-shaped.

[0010] Furthermore, the gripping mechanism includes a hanger, the winch hoists the hanger, a support shaft is fixedly connected between the bottom sides of both ends of the hanger, two grippers are rotatably connected to the outer side wall of the support shaft, a hydraulic rod three is fixedly connected to the middle position of the hanger, a crossbar is fixedly connected to the output end of the hydraulic rod three, and two connecting rods three are rotatably connected to the middle position of the grippers, one end of the connecting rod three is rotatably connected to the crossbar.

[0011] Furthermore, a separation chamber is provided on one side of the separation box, and a discharge port is provided on one side of the bottom of the separation chamber.

[0012] Furthermore, multiple insert rods are equidistantly fixed to the inner wall of one side of the top of the separation chamber.

[0013] Furthermore, both sides of the separation box are fixedly connected to side protective covers, which are used to protect the drive mechanism.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By using a lifting rod and a drive roller, the drive mechanism moves the lifting rod to insert it into the waste in the stacking chamber. Then, the deflection mechanism drives the drive roller to rotate, causing one end of the lifting rod to rise. This allows the lifting rod to pick out flexible waste from the pile. By continuously inserting and lifting the lifting rod into the waste pile, the flexible waste is lifted to the surface of the pile. The gripping mechanism then moves down to grab the flexible waste on the lifting rod, thus removing it from the separation box. This process separates the flexible waste from the pile, enabling preliminary sorting of construction solid waste and improving the automation level of the overall sorting process. By configuring the drive mechanism, including the contact wheel and the wave wheel, the rotation of the drive shaft drives the wave wheel to rotate. The rotating wave wheel squeezes the contact wheel, and the wave-shaped design of the outer contour of the wave wheel causes the grabber to reciprocate and extend outward, making it easier for one end of the grabber to fit into the inclined surface and penetrate into the garbage pile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the deflection mechanism structure in this invention; Figure 3 This is a schematic diagram of the feeding hopper position structure in this invention; Figure 4 This is a schematic diagram of the side protective cover structure in this invention; Figure 5 This is a schematic diagram of the material stacking cavity structure in this invention; Figure 6 This is a schematic diagram of the lifting rod in the raised state structure of this invention; Figure 7 This is a schematic diagram of the lifting mechanism in this invention; Figure 8 yes Figure 7 Enlarged view of a portion at point A; Figure 9 This is a schematic diagram of the pallet structure in this invention; Figure 10 This is a schematic diagram of the gripping mechanism in this invention.

[0016] In the diagram: 100, Separation box; 110, Pallet; 120, Hydraulic rod one; 130, Feed hopper; 140, Stacking chamber; 141, Inclined surface; 150, Side protective cover; 160, Arc-shaped clearance groove; 200, Deflection mechanism; 210, Hydraulic rod two; 220, Connecting rod one; 230, Connecting rod two; 300, Lifting mechanism; 310, Drive roller; 320, Lifting rod; 330, Horizontal frame one; 340, Return spring; 400, Drive mechanism; 410, Horizontal frame two; 411 412. Slide rod; 420. Guide wheel one; 430. Drive motor; 440. Guide wheel two; 450. Drive shaft; 460. Pull rope; 470. Contact wheel; 480. Wave wheel; 500. Rewinding wheel; 510. Gripping mechanism; 520. Hanger; 530. Support shaft; 540. Gripper; 541. Hydraulic rod three; 550. Crossbar; 600. Connecting rod three; 610. Separation chamber; 620. Discharge port; 700. Insert rod; 710. Electric slide rail; 710. Winch. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-7In this embodiment of the invention, a smart construction waste sorting device includes a separation box 100, a deflection mechanism 200, a lifting mechanism 300, a drive mechanism 400, a gripping mechanism 500, and an electric slide rail 700. One end of the separation box 100 is fixedly connected to a feed hopper 130. A stacking cavity 140 is formed inside the separation box 100, and a support plate 110 is provided at the bottom of the stacking cavity 140. There are two lifting mechanisms 300, which are positioned on opposite sides of the separation box 100. Each lifting mechanism 300 includes a drive roller 310, which is rotatably connected to the separation box 100. Multiple lifting rods 320 are equidistantly slidably inserted into the outer wall of the drive roller 310. There are two drive mechanisms 400, each corresponding to one of the two lifting mechanisms 300. The drive mechanism 400 is used to drive the lifting rod 320 to slide on the transmission roller 310. The deflection mechanism 200 is fixed at the other end of the separation box 100. The deflection mechanism 200 is connected to one end of the two transmission rollers 310. The deflection mechanism 200 is used to drive the transmission rollers 310 to rotate. The gripping mechanism 500 is set above the separation box 100. The gripping mechanism 500 is used to grip the garbage. The electric slide rail 700 is fixedly installed above the separation box 100. A winch 710 is fixedly installed on the moving end of the electric slide rail 700. The winch 710 is used to lift and lower the gripping mechanism 500.

[0019] Specifically, construction solid waste is poured into the feed hopper 130, and the waste accumulates in the stacking cavity 140. Then, the drive mechanism 400 drives the lifting rod 320 to extend outward relative to the transmission roller 310, inserting it laterally and downward into the waste in the stacking cavity 140. Subsequently, the deflection mechanism 200 drives the transmission roller 310 to rotate, causing the lifting rod 320 to deflect, raising one end of the lifting rod 320. This lifts out flexible waste (including ropes, woven nets, textiles, plastic bags, etc.) from the waste. The drive mechanism 400 then retracts one end of the lifting rod 320, causing the flexible waste on the lifting rod to fall back onto the surface of the waste pile. Then, the deflection mechanism 200 drives the transmission roller 310 to rotate, causing one end of the lifting rod 320 to deflect downward. Finally, the drive mechanism 400 extends the lifting rod 320, forming a cycle (the movement trajectory of one end of the lifting rod 320 is shown in the attached figure). Figure 6(As shown by the dotted line in the middle), the lifting rod 320 is continuously inserted and lifted in the waste pile to pick up the flexible waste in the waste pile to the surface of the waste pile. Then, when the lifting rod 320 lifts up for the last time, it stops at the upward position. After the flexible waste is picked up on the lifting rod 320, the winch 710 drives the grabbing mechanism 500 to move down. The grabbing mechanism 500 grabs the flexible waste on the lifting rod 320, thereby carrying the flexible waste away from the separation box 100, realizing the separation of flexible waste in the waste pile. Then, the pallet 110 deflects downward to discharge the waste pile from the stacking cavity 140, realizing the preliminary classification of construction waste, which facilitates the subsequent crushing and recycling of flexible waste.

[0020] Example 1 like Figures 4-8 As shown, in this embodiment, one end of the pallet 110 is rotatably connected to one end of the separation box 100. A hydraulic rod 120 is provided below the pallet 110, with one end of the hydraulic rod 120 rotatably connected to the pallet 110 and the other end of the hydraulic rod 120 rotatably mounted on the ground. Inclined surfaces 141 are provided on both sides of the inner wall of the separation box 100 at the positions of the stacking cavity 140. The inner walls of both sides of the separation box 100 are provided with openings corresponding to the positions of multiple lifting rods 320. There is an arc-shaped clearance groove 160. One end of the lifting rod 320 passes through the arc-shaped clearance groove 160 at the corresponding position and extends into the material stacking cavity 140. The deflection mechanism 200 includes a hydraulic rod 210. The bottom end of the hydraulic rod 210 is fixedly connected to the other end of the separation box 100. One end of the transmission roller 310 is fixedly sleeved with a connecting rod 230. One end of the connecting rod 230 is rotatably connected to a connecting rod 220. One end of the two connecting rods 220 is rotatably connected to the movable end of the hydraulic rod 210. The drive mechanism 400 includes a second crossbeam 410, a first crossbeam 330 fixedly connected to the other ends of multiple lifting rods 320, a sliding rod 411 fixedly connected to both ends of one side wall of the second crossbeam 410, the sliding rod 411 slidably inserted into the first crossbeam 330, a drive shaft 440 rotatably connected between the two ends of the second crossbeam 410, a drive motor 420 fixedly mounted at one end of the second crossbeam 410, the output end of the drive motor 420 being drively connected to one end of the drive shaft 440, rotatable guide wheels 430 fixedly mounted at both ends of the outer side wall of the drive roller 310, a take-up wheel 480 fixedly sleeved on the outer side wall of one end of the drive shaft 440, and rotatable guide wheels 412 mounted at both ends of the other side wall of the second crossbeam 410. One end of the pull rope 450 is fixedly connected to the pull rope 450. One end of the pull rope 450 passes sequentially around a guide wheel 430, two guide wheels 412 and another guide wheel 430 located at one end of the transmission roller 310. One end of the pull rope 450 is wound and connected to the winding wheel 480. The other end of the lifting rod 320 is movably sleeved with a return spring 340. The return spring 340 is located between the cross frame 330 and the transmission roller 310. Circular holes are opened on the cross frame 330 and the cross frame 410 at the positions where the pull rope 450 passes through. Contact wheels 460 are rotatably connected to both ends of one side wall of the cross frame 330. Wave wheels 470 are fixedly sleeved on the outer side wall of the transmission shaft 440 at the positions of the two contact wheels 460. The outer contour of the cross section of the wave wheel 470 is wavy.

[0021] In this embodiment, when the deflection mechanism 200 drives the transmission roller 310 to rotate, the movable end of the hydraulic rod 210 extends, thereby pulling the connecting rod 220 to deflect. The connecting rod 220 drives the transmission roller 310 to deflect, thereby controlling the deflection of the lifting rod 320. When the drive mechanism 400 drives the lifting rod 320 to extend and retract, the drive motor 420 drives the transmission shaft 440 to rotate, and the transmission shaft 440 drives the winding wheel 480 to rotate, thereby winding up one end of the pull rope 450, tightening the pull rope 450. The crossbeam 2 410 is driven to move closer to the transmission roller 310. The crossbeam 2 410 pushes the crossbeam 330 to drive the lifting rod 320 to extend against the elastic force of the return spring 340. The drive motor 420 drives the transmission shaft 440 to extend. When rotating in the reverse direction, the winding wheel 480 loosens its winding of the pull rope 450, causing the pull rope 450 to relax. This allows the lifting rod 320 to retract under the elastic force of the return spring 340. Since the lifting rod 320 retracts after being raised, there is no garbage pile interfering with the retraction of the lifting rod 320. This facilitates the return spring 340 in driving the lifting rod 320 to retract. Furthermore, through the arrangement of the contact wheel 460 and the wave wheel 470, when the drive shaft 440 rotates, it drives the wave wheel 470 to rotate. The rotation of the wave wheel 470 squeezes the contact wheel 460. Through the wave-shaped setting of the outer contour of the wave wheel 470, the lifting rod 320 is driven to reciprocate and extend outward, making it easier for one end of the lifting rod 320 to fit into the inclined surface 141 and penetrate into the garbage pile.

[0022] Example 2 like Figures 7-10 As shown, in this embodiment, the gripping mechanism 500 includes a hanger 510, a winch 710 for hoisting the hanger 510, a support shaft 520 fixedly connected between the bottom sides of both ends of the hanger 510, two grippers 530 rotatably connected to the outer side wall of the support shaft 520, a hydraulic rod 540 fixedly connected to the middle position of the hanger 510, a crossbar 541 fixedly connected to the output end of the hydraulic rod 540, two connecting rods 550 rotatably connected to the middle position of the grippers 530, one end of the connecting rod 550 rotatably connected to the crossbar 541, a separation chamber 600 is provided on one side of the separation box 100, a discharge port 610 is opened on one side of the bottom end of the separation chamber 600, a plurality of insert rods 620 are fixedly fixedly at equal intervals on the inner wall of one side of the top end of the separation chamber 600, and side protective covers 150 are fixedly connected to both sides of the separation box 100, the side protective covers 150 are used to protect the drive mechanism 400.

[0023] In practice, the output end of hydraulic rod 3 540 retracts, thereby driving the crossbar 541 to move upward. The crossbar 541 drives the two grippers 530 to open via connecting rod 3 550. Then, the winch 710 drives the gripping mechanism 500 to move downward, so that the grippers 530 are inserted between multiple lifting rods 320. The output end of hydraulic rod 3 540 extends outward, driving the two grippers 530 to close. The gripping mechanism 500 is lifted upward, thereby gripping the flexible waste on the lifting rods 320. The winch 710 moves laterally, moving the closed gripping mechanism 500 to the top position of the separation chamber 600. Then, the gripping mechanism 500 opens and throws the flexible waste into the separation chamber 600. Through the setting of the insertion rod 620, the insertion rod 620 is inserted into the laterally moving grippers 530, thereby reducing the residue of flexible waste on the grippers 530 and facilitating the release of flexible waste by the grippers 530.

[0024] In this invention, to facilitate the control of the height of the garbage pile in the working material storage chamber 140 of the lifting rod 320 to be below the height of the transmission roller 310, thus preventing the garbage from grinding against the transmission roller 310 and facilitating the rotation of the lifting rod 320 and the transmission roller 310, and to facilitate the operator's control of this invention, a PLC controller can be set up. The drive motor 420, electric slide rail 700, winch 710, hydraulic rod one 120, hydraulic rod two 210 and hydraulic rod three 540 are electrically connected to the PLC controller. The PLC controller is existing technology and will not be described in detail here. Through the PLC controller, the number of times the lifting rod 320 is lifted in cycles can be adjusted according to the content of flexible garbage in the garbage pile and the difficulty of separation, so as to facilitate intelligent adjustment according to the specific situation of the garbage.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A smart sorting device for construction waste, characterized in that, include: A separation box (100) is fixedly connected to a feed hopper (130) at one end. The separation box (100) has a material stacking cavity (140) inside, and a tray (110) is provided at the bottom of the material stacking cavity (140). There are two lifting mechanisms (300), which are located on both sides of the separation box (100). Each lifting mechanism (300) includes a drive roller (310) which is rotatably connected to the separation box (100). Multiple lifting rods (320) are equidistantly inserted into the outer wall of the drive roller (310). There are two drive mechanisms (400), each corresponding to one of the two lifting mechanisms (300). The drive mechanism (400) is used to drive the lifting rod (320) to slide on the transmission roller (310). The deflection mechanism (200) is fixed at the other end of the separation box (100). The deflection mechanism (200) is connected to one end of the two transmission rollers (310). The deflection mechanism (200) is used to drive the transmission rollers (310) to rotate. A gripping mechanism (500) is disposed above the separation box (100) and is used to grip the garbage; an electric slide rail (700) is fixedly installed above the separation box (100), and a winch (710) is fixedly installed on the moving end of the electric slide rail (700) and is used to lift the gripping mechanism (500); The drive mechanism (400) includes a second crossbeam (410), and a first crossbeam (330) is fixedly connected to the other ends of the plurality of lifting rods (320). A sliding rod (411) is fixedly connected to both ends of one side wall of the second crossbeam (410), and the sliding rod (411) is slidably inserted into the first crossbeam (330). A drive shaft (440) is rotatably connected between the two ends of the second crossbeam (410). A drive motor (420) is fixedly installed at one end of the second crossbeam (410), and the output end of the drive motor (420) is connected to one end of the drive shaft (440). Rotatable guide wheels (430) are fixedly installed at both ends of the outer side wall of the drive roller (310). A take-up wheel (480) is fixedly sleeved on the outer side wall of one end of the drive shaft (440). Rotatable guide wheels (412) are installed at both ends of the other side wall of the second crossbeam (410). One end of the 0) is fixedly connected to a pull rope (450). One end of the pull rope (450) passes sequentially around a guide wheel 2 (430), two guide wheels 1 (412) and another guide wheel 2 (430) located at one end of the transmission roller (310). One end of the pull rope (450) is wound and connected to the winding wheel (480). The other end of the lifting rod (320) is movably sleeved with a return spring (340). The return spring (340) is located between the cross frame 1 (330) and the transmission roller (310). Circular holes are opened on the cross frame 1 (330) and the cross frame 2 (410) at the positions where the pull rope (450) passes through. Contact wheels (460) are rotatably connected to both ends of one side wall of the cross frame 1 (330). Wave wheels (470) are fixedly sleeved on the outer side wall of the transmission shaft (440) at the positions of the two contact wheels (460). The outer contour of the cross section of the wave wheel (470) is wave-shaped.

2. The intelligent sorting device for construction waste according to claim 1, characterized in that, One end of the pallet (110) is rotatably connected to one end of the separation box (100). A hydraulic rod (120) is provided below the pallet (110). One end of the hydraulic rod (120) is rotatably connected to the pallet (110), and the other end of the hydraulic rod (120) is rotatably installed on the ground.

3. The intelligent sorting device for construction waste according to claim 1, characterized in that, The inner wall of the separation box (100) is provided with inclined surfaces (141) on both sides of the stacking cavity (140). The inner walls of both sides of the separation box (100) are provided with arc-shaped clearance grooves (160) corresponding to the positions of multiple lifting rods (320). One end of the lifting rod (320) passes through the arc-shaped clearance groove (160) at the corresponding position and extends into the stacking cavity (140).

4. The intelligent sorting device for construction waste according to claim 3, characterized in that, The deflection mechanism (200) includes a second hydraulic rod (210), the bottom end of which is fixedly connected to the other end of the separation box (100). One end of the transmission roller (310) is fixedly sleeved with a second connecting rod (230), and one end of the second connecting rod (230) is rotatably connected to a first connecting rod (220). One end of the two first connecting rods (220) is rotatably connected to the movable end of the second hydraulic rod (210).

5. The intelligent sorting device for construction waste according to claim 1, characterized in that, The gripping mechanism (500) includes a hanger (510), and the winch (710) lifts the hanger (510). A support shaft (520) is fixed between the bottom sides of both ends of the hanger (510). Two grippers (530) are rotatably connected to the outer side wall of the support shaft (520). A hydraulic rod (540) is fixedly connected to the middle position of the hanger (510). A crossbar (541) is fixedly connected to the output end of the hydraulic rod (540). Two connecting rods (550) are rotatably connected to the middle position of the grippers (530). One end of the connecting rod (550) is rotatably connected to the crossbar (541).

6. The intelligent sorting device for construction waste according to claim 5, characterized in that, A separation chamber (600) is provided on one side of the separation box (100), and a discharge port (610) is provided on one side of the bottom end of the separation chamber (600).

7. The intelligent sorting device for construction waste according to claim 6, characterized in that, Multiple insert rods (620) are fixed at equal intervals to the inner wall of one side of the top of the separation chamber (600).

8. The intelligent sorting device for construction waste according to claim 6, characterized in that, Both sides of the separation box (100) are fixedly connected to side protective covers (150), which are used to protect the drive mechanism (400).

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